Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-06-04
1993-06-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 85, 330 97, 330260, H03F 345, H03F 134
Patent
active
052183203
ABSTRACT:
A wideband amplifier circuit having automatic offset voltage and gain control, the circuit comprising a main amplifier chain, a negative feedback loop for controlling gain, and a negative feedback loop for controlling and cancelling any possible offset voltage at its output, said main amplifier chain including a gain control amplifier block having a gain control input connected to the gain control negative feedback loop; wherein the gain control amplifier block is preceded in the main chain by a symmetrizer-adder block of fixed gain having a first input constituting the input of the amplifier circuit and a second input connected to the negative feedback loop for controlling and cancelling any possible offset voltage at the output.
REFERENCES:
patent: 3757239 (1973-09-01), Langan
patent: 4088962 (1978-05-01), Trilling
patent: 4973917 (1990-11-01), Johnson
Patent Abstracts of Japan, vol. 9, No. 43 (E-298), Feb. 22, 1985; & JP-A-59 183 516 (Nippon Denki K.K.) Oct. 18,1984.
Electronics and Communications in Japan, vol. 67-C, No. 4, 1984, pp. 85-92, New York, US; T. Kamoto et al.: "Bipolar monolithic very-wideband amplifier".
Albouy Pierre
Cochennec Guy
ALCATEL N.V.
Mullins James B.
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